"I ate my last meal in October, and I run about 40 miles a day," he told Us Weekly Tuesday at the Diesel show in NYC. "I'm joking! It's just doing a lot of cardio and extremely watching what I eat. I stopped lifting big weights and I'm doing yoga."

"If I wear a long shirt, everyone says, 'Oh my, God! He lost so much weight.' But this is how I look," he explained. "I just used to be a lot bigger. But now I'm surfing. I'm doing a surf movie so I have to slim down. I don't know... maybe I'm sick or something!"

So is there a lucky lady enjoying Butler's hot new bod? Not according to him. "I'm single," he told Us.

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